代码优化

lib/utils/epub/volume_control_service.dart

@@ -1,50 +0,0 @@
-import 'dart:async';
-import 'dart:io';
-import 'package:flutter/services.dart';
-
-/// 音量键翻页服务
-/// 注意：需要原生 Android 实现才能工作，当前为空操作
-class VolumeControlService {
-  static const MethodChannel _methodChannel = MethodChannel(
-    'mooknote/volume_control',
-  );
-
-  static bool _available = false;
-  static bool _checked = false;
-
-  static Future<void> enableInterception() async {
-    if (!Platform.isAndroid) return;
-    if (!_checked) await _checkAvailable();
-    if (!_available) return;
-    try {
-      await _methodChannel.invokeMethod('enableInterception');
-    } catch (_) {}
-  }
-
-  static Future<void> disableInterception() async {
-    if (!Platform.isAndroid) return;
-    if (!_available) return;
-    try {
-      await _methodChannel.invokeMethod('disableInterception');
-    } catch (_) {}
-  }
-
-  static Stream<String> get volumeKeyEvents {
-    if (!Platform.isAndroid || !_available) return const Stream.empty();
-    // 需要原生 EventChannel 实现，当前返回空流
-    return const Stream.empty();
-  }
-
-  /// 检查原生端是否实现了该 channel
-  static Future<void> _checkAvailable() async {
-    _checked = true;
-    try {
-      await _methodChannel.invokeMethod('enableInterception');
-      _available = true;
-    } on MissingPluginException {
-      _available = false;
-    } catch (_) {
-      _available = false;
-    }
-  }
-}